Containment Air Filtration System

Passive containment cooling system storage tank and associated valves (these are within the shield building, but outside the containment vessel, with their own dedicated heating, ventilation, and air conditioning (HVAC) system, completely separate from the containment air filtration system). 

Air intake plenum for the radiologically controlled area ventilation system and the containment air filtration system. 

Exhaust units from the containment air filtration system. 

The containment air filtration system (VFS) serves the containment, the fuel handling area and the other radiologically controlled areas of the auxiliary and annex buildings, except for the hot machine shop and health physics areas which are served by a separate ventilation system. 

The containment air filtration system consists of two 100 percent capacity supply air handling units, a ducted supply and exhaust air system with containment isolation valves and piping, registers, exhaust fans, filtration units, automatic controls and accessories. The supply air handling units are located in the south air handling equipment room of the annex building. 

When both trains are operated concurrently, the containment air filtration system provides a maximum airflow rate equivalent to approximately 0.21 air changes per hour (see section 9.4.7.2.3 of Reference 6.1). 

The air filtration system is one example of the complex and unique systems operating at JACADS. The filter system reduces the concentration of toxic agents in the ventilated air to levels that are harmless to operating personnel, the environment, and the surrounding population. The system consists of ten filter units. Each filter unit contains ... 

CDs can form inclusion complexes with iodine, which makes them candidates for iodine-sorption from nuclear waste gases. In model experiments, it was shown that the aqueous solutions containing CDs and crosslinked CD polymers were selective and effective iodine absorbers [86]. Especially the cr-CD derivatives (methylated and crosslinked) have high sorption capacity. On the basis of the results, the binding of elemental and organic iodine emitted into the air by chemical and nuclear power plants can be made effectively by immobilizing iodine vapor in aqueous CD solutions or in CD polymer gel beds. Such new sorbents can be employed in the air filtration systems (Table 8.4). 

Containment high range radiation monitor. These monitors measure the radiation from the radioactive gases in the containment atmosphere. The data is displayed in the main control room. Alarms are provided in the main control room and signals to the protection and safety monitoring system for containment air filtration isolation and normal heat removal system valve closure. 

Ambient air contains many solid impurities, ranging from visible grit down to fine dusts, smokes and fumes [10]. An air-conditioning system will aim to remove a proportion of these, depending on the application. There are three reasons for air filtration ... 

The terminal HEPA filtration module (TFM) is a self-contained HEPA filter and plenum unit (Fig. 11), which may be used to provide laminar or conventional airflow to a clean space, or may be dedicated as a LAF workstation.f The TFM is available with a 10 in. (optional 12 inch) collar for connection by a circular supply duct to a central air handling system (Fig. 5A) or as a free-standing, fully powered unit containing a motor and blower. It is normally installed in a... 

The filtration system contains carbon filters for removing the contaminants from the building air. This system also maintains the process areas in the facility under negative pressure. Negative pressure is an engineering control that ensures that potentially contaminated building air is not released into the environment. 

Filtration systems. When pellets or powders are blown into a silo by either a bulk delivery truck or via a railcar unload system, there is a large volume of air which must be exhausted into the atmosphere. In the case of materials such as PE or PP pellets, the amount of fines contained in the exhaust is negligible while with other materials, especially powders, the dust loading is considerable and elaborate filtration is required. Several systems in widespread use are (see Fig. 7.6). 

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